The Jaguar XF side marker utilizes 7443 and 12961 bulb sizes for illumination across various production versions. Data for the specified lighting components covers the range from 2009 to 2024.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Jaguar XF front side marker position uses two distinct bulb types across its model years: the 12961 and the 7443.
The 12961 is a Philips part number designating a miniature wedge bulb in the T10 form factor, fitted with a W2.1x9.5d base and rated at 12V and 5W.
The 7443 follows the ANSI standard recognized in the United States and Canada. It is a dual-filament wedge bulb in the T20 form factor, rated at 12V with a 21W main filament and a 5W secondary filament.
The Jaguar XF front side marker uses the 12961 bulb for model years 2009-2015.
The 7443 bulb applies to the Jaguar XF front side marker for model years 2021-2024, with no entry present for 2022.
The T10 and T20 designations refer to the tubular envelope width of each bulb, with T10 being the narrower of the two. The physical size difference between these two types means they are not interchangeable.
The W2.1x9.5d base of the 12961 is a wedge-type base defined by IEC standards, where the figures describe the contact width and pin spacing. The 7443 also uses a wedge base, though its larger T20 envelope corresponds to a physically wider seating.
The single-filament nature of the 12961 contrasts with the dual-filament design of the 7443. In a dual-filament bulb such as the 7443, each filament operates independently, allowing one circuit to draw 21W and the other 5W depending on the function activated.
The wattage difference between the two bulb types is significant. The 12961 draws 5W, while the 7443 can draw up to 21W on its primary filament, which reflects a difference in the electrical load placed on the vehicle's wiring circuit.
Because the 12961 and 7443 differ in base size, filament count, and wattage, substituting one for the other in a Jaguar XF front side marker socket would be electrically and physically incompatible.